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Stress tensors and quantification of fracture patterns to analyze connectivity and potential fluid flow in a mesa landform of the Northern Andes

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Journal of Mountain Science 2024年第1期21卷 271-291页

作者： gARCÍA-ARIAS Sergio VELANdIA Francisco ALVAREZ Angélica sanabria-gómez joséd TARAZONA Yessenia VARgAS María Camila Escuela de geología Universidad Industrial de SantanderCra.27 Calle 9BucaramangaColombia Escuela de Física Universidad Industrial de SantanderCra.27 Calle 9BucaramangaColombia

This work applies stress tensors inversions and quantification of fracture patterns along the Mesa de Los Santos, in the Eastern Cordillera of Colombia, to better understand the potential fluid flow. It thus contributes to the conceptual hydrogeological model. The area was subdivided into three blocks, separated by the NW Potreros and the Los Santos faults, having minor inner faults of different orientations. This separation facilitates the analysis of the fractures measured in the field, which in general show high dip angles and a conjugate geometry in the northern block, tension fractures(Mode I) in the central block, and a random distribution in the southwestern block. WinTensor treatment of slickensides yielded a maximum horizontal stress(SHmax) of 111o, which coincides with the WNW-ESE tensor observed from the conjugate and tension joints. We then used Frac Pa Q to generate interpolation maps of fracture intensity and density. The maps show the highest values in the central block and the lowest in the northern block,where the precipitation is higher, causing intensive rock weathering and homogenization of the fracture planes. Although the highest values of connectivity by line are found to the south of the mesa, we suggest the possibility of greater flow from the recharge zone(NE) along bedding planes and open NW-SE fractures.

关键词： Mesa de Los Santos Colombia Win-Tensor FracPaQ Strike-slip faults Fractured aquifers

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draft of Spanish Standard for the Use of Recycled Aggregate in the Production of Structural Concrete

Draft of Spanish Standard for the Use of Recycled Aggregate ...

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The 6th International Symposium on Cement & Concrete and Canmet/Aci International Symposium on Concrete Technology for Sustainable development

作者： Pilar Alaejos Marta Sánchez de Juan Marilda Barra Manuel Burón Enrique dapena Miren Etxebarría gilbert Francisco Belén gonzález Fonteboa Fernando Martínez Abella Isabel Martínez Lage josé Luis Parray Alfaro Juan Antonio Polanco Mariano sanabria Enric Vázquez Task Force of Standing Committee of Concrete

In November 2002, the Spanish Standing committee of Concrete created a task force commissioned to draft a document to complement current regulations on structural concrete and to set out specific reco

关键词： Recycled concrete aggregate, Standardization, structural concrete.

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